But the exclusive claims to god-given authority, made by hysterical clerics on both sides and further stoked by Armageddon-minded Christians who hope to bring on the Apocalypse (preceded by the death or conversion of all Jews), have made the situation insufferable, and put the whole of humanity in the position of hostage to a quarrel that now features the threat of nuclear war.
This quote is the authors response to Abba Eban saying that the essential point [creating Palestine and Israel] was a simple one. Two peoples of roughly the same size had a claim to the same land. The solution, obviously, to create two states side by side.

